<!DOCTYPE html>
<html lang="zh">
<head>
    <meta charset="UTF-8">
    <title>手写JQuery</title>
</head>
<body>
<div class="test">
    <span>你好1</span>
    <div class="child">child1</div>
    <div class="child">child2</div>
    <div class="child">child3</div>
</div>
<div class="test">你好2
    <div class="child">child1</div>
    <div class="child">child1</div>
</div>
<div class="test">你好3
    <div class="child">child1</div>
</div>
<script src="jquery.js"></script>
<script src="main.js"></script>
</body>
</html>